--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Target/Hexagon/HexagonBitTracker.h	Tue Oct 13 17:48:58 2015 +0900
@@ -0,0 +1,64 @@
+//===--- HexagonBitTracker.h ----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef HEXAGONBITTRACKER_H
+#define HEXAGONBITTRACKER_H
+
+#include "BitTracker.h"
+#include "llvm/ADT/DenseMap.h"
+
+namespace llvm {
+  class HexagonInstrInfo;
+  class HexagonRegisterInfo;
+
+struct HexagonEvaluator : public BitTracker::MachineEvaluator {
+  typedef BitTracker::CellMapType CellMapType;
+  typedef BitTracker::RegisterRef RegisterRef;
+  typedef BitTracker::RegisterCell RegisterCell;
+  typedef BitTracker::BranchTargetList BranchTargetList;
+
+  HexagonEvaluator(const HexagonRegisterInfo &tri, MachineRegisterInfo &mri,
+                   const HexagonInstrInfo &tii, MachineFunction &mf);
+
+  bool evaluate(const MachineInstr *MI, const CellMapType &Inputs,
+                CellMapType &Outputs) const override;
+  bool evaluate(const MachineInstr *BI, const CellMapType &Inputs,
+                BranchTargetList &Targets, bool &FallsThru) const override;
+
+  BitTracker::BitMask mask(unsigned Reg, unsigned Sub) const override;
+
+  MachineFunction &MF;
+  MachineFrameInfo &MFI;
+  const HexagonInstrInfo &TII;
+
+private:
+  bool evaluateLoad(const MachineInstr *MI, const CellMapType &Inputs,
+                    CellMapType &Outputs) const;
+  bool evaluateFormalCopy(const MachineInstr *MI, const CellMapType &Inputs,
+                          CellMapType &Outputs) const;
+
+  unsigned getNextPhysReg(unsigned PReg, unsigned Width) const;
+  unsigned getVirtRegFor(unsigned PReg) const;
+
+  // Type of formal parameter extension.
+  struct ExtType {
+    enum { SExt, ZExt };
+    char Type;
+    uint16_t Width;
+    ExtType() : Type(0), Width(0) {}
+    ExtType(char t, uint16_t w) : Type(t), Width(w) {}
+  };
+  // Map VR -> extension type.
+  typedef DenseMap<unsigned, ExtType> RegExtMap;
+  RegExtMap VRX;
+};
+
+} // end namespace llvm
+
+#endif